I switched the terminals around (reversed the continuity I assume) and at least now I can plug the harness in with the key on and the doors remain shut like it should, and they open when the lights are switched on. (everything good so far)

--> The problem now is once I switch the lights off, the headlight doors remain open.

I'm assuming there has to be a limit switch somewhere that reverses the polarity when the lights are off. I just need to understand it.

Thanks
Mike